I've had Blu for almost a year now & for the pst few weeks (yes a few Weeks), He hasn't been eating nearly as much as he used to, until he gradullay stopped eating at all...At first I thought he was just depressed, it's been a bit chillier in the room where we keep him. But then Blu started floating to the top on his side, which after I googled (Betta Constipation) this is most severe case....
I've tried the Inside of Peas like suggested, everywhere, he ate 1 & pooped a little, but he's still bloated & floating sideways. He shows no interest in eating any more peas, I've dangled them, dropped them in front of him, put then on his plant at top of the water so it's accessible for him without getting to bottom, I see he can't stay down there long....
I change water regularly, & keep it warm.
How can I fix Blu - I don't want him to die!

I would try some daphnia instead of peas. They're more natural and healthy for bettas. You can get frozen or freeze dried. Freeze dried needs to be rehydrated before feeding to avoid digestive problems.